Table 3

Regression analysis of blood pressure parameters and measures of blood pressure variability with clinical outcomes of 20/200 or worse vision, increase in Snellen lines of visual acuity, worsening logMAR vision and macular redetachment status at POM6, adjusted for preoperative level of detachment and type of anaesthesia used

Risk factorVisual acuity of 20/200 or worse at POM6Increased snellen lines of improvement at POM6Worsening logMAR visual acuity at POM6Macular redetachment at POM6
Higher preoperative MAP0.013−0.054**0.010†0.007
Higher mean intraoperative SBP0.034*−0.024†0.011*0.018
Higher mean intraoperative DBP0.053*−0.0400.0170.033
Higher mean intraoperative MAP0.054*−0.043†0.018*0.032
Higher intraoperative SD of SBP0.100*−0.083*0.035*−0.004
Higher intraoperative SD of DBP0.126−0.1260.048−0.109
Higher intraoperative SD of MAP0.121†−0.124*0.046−0.027
  • Notes: Risk factors are shown in rows and outcomes are shown in columns. The value of coefficients indicate a stronger association (for positive values) or reverse association (negative value) with the outcomes. The marker next to each coefficient indicates its statistical significance, and also conveys the uncertainty in the association relative to its strength. Coefficients with p<0.05 are highlighted with darker border and cell shading. The largest absolute value of the coefficients with the smallest p values, therefore, indicate the strongest and least noisy associations.

  • Coefficients were obtained using generalised estimating equations considering each patient as a cluster. All analyses were performed on 71 eyes (57 patients), except when using preoperative MAP where there were 68 eyes (55 patients).

  • *p<0.05, **p<0.01.

  • †p<0.10.

  • DBP, diastolic blood pressure; MAP, mean arterial pressure; POM6, postoperative month 6; SBP, systolic blood pressure.